Anytime…
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If you use that 30% peroxide it will kill all the bacteria, beneficial ones included, but as you’re not in organics I really don’t know if they are needed to feed the plant 
. Remove the affected leaves and try to rub them as it has been wisely said to see if it is fungus or not, that’s the first thing to do before trying to solve it … 
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@Dgsg absolutely check those leaves and ppm and ph
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it was a sponge. Thank you very much for the advice. I completely disinfected the system, changed the solution and will wait for them to recover. Growth has stopped a lot. hopefully they will be fine.
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A sponge??
Most aero systems are best run in intervals… you’ll have to do some reading but if I recall I used to something like 1 minute on 15 minutes off. Basically you want enough for the chamber to stay ‘moist’ but also allow the roots lots of oxygen.
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Thank you. I was just looking for information on this topic 
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There are some very technical aero discussions on og here if you search around. I haven’t done aero in years but it’s a really great system if you can dial it in. Good luck!
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Thank you for being grateful for your advice
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So friends, I figured out what the problem was. I had a defective piece of ph meter from the store, which measured 1.0-1.5 ph all the time.
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Jesus i had same thing happen .thats why you keep a chem set on hand.
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was not. will be
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